Stop motion for looms, etc.



Feb. 24, 1948. J. KYNER STOP MOTION FOR L00MS,ETG.

Filed Feb. 6.1946

Patented Feb. 24, 1948.

UNITED STATES PATENT OFFICE STOP MOTIJlfZi'flfLOOMS, ETC.

Julia Kyner, Zionsville. Pa.

Application February 8, 1948, Serial No. 845,832

12 Claims. 1-

This invention relates to stop motions for textile machinery, whereinsingle yarns or threads, or a multiplicity thereof, are normally adaptedto be drawn or pulled in a predetermined direction axially orlongitudinally thereoi and maintained under a substantially uniformpredetermined tension as each yarn travels axially be-' tween tworelatively distant points, as will be round in winding, twisting,warping, knitting,

weaving, and other machinery employed in the textile industry. I

The present invention relates particularly to a. device for detectingthe development of excessive slack in a running thread or yarn, or thebreak-. ing of the yarn under excessive tension, or for other reasonssuch as weak spots present in the structure of theyarn itself, etc.

In the accompanying drawing:

Fig. l is a diagrammatic perspective view. partly in section,illustrating the general construction and principles of operation of thedevice;

Fig. 2 is an enlarged view, partly in section, oi the detecting deviceper se;-

Fig. 3 is a face view of the structure illustrated in Fig. 2, showingthe traveling yarn in cross section; and 8 Figs. 4 and 5 illustratemodifications of the invention.

'In Fig. 1 of the drawing, a thread or yarn is is shown as being drawnfrom a supply package, such as a spool or bobbin g, which is rotatablymounted on a supporting spindle 2. Any suitable friction means may beemployed to retard the rotation of the package 11 on its supportingspindle z to place the yarn a: under predetermined tension as it isdrawn from the package 1/. As such friction devices are-common in theart and form no part of the present invention, no illustration thereofhas been made in the present drawing.

The yarn or thread a: is adapted to be drawn longitudinally in thedirection of the arrows a, a,

under a substantially uniform tension, by the' weaving of the thread a:in a loom, the formationef the yarn into loops in a knitting machine, orthe winding of the thread onto a warp beam, etc., against the action ofthe friction device which retards the rotation'of said package y, aspreviously noted.

Preferably, in the course 01 its axial travel. the yarn :r is laid overand is adapted to bear on and be'supported and guided by a pair ofrelatively spaced rods or rollers b, b, whereby a predetermined section11 of the traveling yarn or is maintained in a substantially straightline.

The detector element I of the present invention comprises a piece ofhighly resilient metal such, for example as beryllium copper of springquality, bent into the general shape of a sickle and consisting of anarcuate body section 2, a substantially straight leg portion 8 connectedby a short radius curved or fillet portion 4, by which flexibilitybetween the parts 2 and 3 is provided, and which will permit said partsto move toward or away from each other under operating con- 'ditionshereinafter described. The leg portion 3 of the detector I is connectedby a small radius curved portion 5 with a straight foot portion 6 'whichis adapted to be rigidly mounted in a support I. v

The detecting device I, and particularly the arcuate head portion 2thereof, is adapted to be mounted and to operate between a pair ofparallel reed or siey blades or fingers 8, 8, which are normally adaptedto limit lateral movement of the-running thread or yarn a: as it travelsin the direction of the arrows a, a. The lower end portions of the guidefingers 8, 8 are also rigidly mounted in the support I in the same planewith or in a plane parallel to and preferably immediately adjacent theplane of the foot 6 of the detector l. While the foot 6 of the detectorl and the'ends 9, 9 of the fingers 8, 8 may be secured to the support Iin any desired manner, it is preferable to cast the support I in theform of a block around the foot 6 and ends 9, 9, of the fingers 8, 8,whereby these elements are maintained in rigid fixed relation to eachother.

Intermediate the fingers 8, 8, the arcuate body portion 2 of thedetector l is bent into a V- shape cross sectional form, to provide atrough i0 for receiving and supporting the yarn :r. The diverging armsH, II of the V-shape l trough Ill, in each instance, substantially fillthe space between the fingers 8, 8 with just sufficient clearancetherebetween to prevent binding of the body portion 2 of the detector ibetween the laterally spaced fingers 8, 8.

In instances where a plurality or multiplicity oi yarns a: are arrangedside by side, such as the warps of. a loom or a warp knitting machine,

etc., there would be a detector l for each yarn or.

sley' points 8, 8 would be divided into groups and.

each group would be leaded into a single block 1, if desired. a

The supporting blocks 1, in which the detec tors I, I and fingers 8, 8are rigidly secured, are

adapted to be secured to a suitable support, such as a bus bar 12, as bya bolt or screw I3, for example, with the bus bar I2 grounded in anysuitable manner in the machine in which the detectors I, I are employed,said bus bar forming one side of an electric circuit in which thedetector I is included.

The second side of the electrical circuit is formed by the bus bar Itwhich is suitably supported in the machine by a plurality of insulatorlugs or brackets I5.

In the present instance, the bus bar I4 is of L-shaped cross sectionwith one leg or flange I8 thereof secured in the insulator lugs I and.

with the edge I! of the second leg ill of the bus bar disposed adjacentthe small radius fillet or neck portion 4 of the detector I.

The bus bar I4 is adapted to be connected by a. conductor ill with oneside of a relay 2Uwhich constitutes a part of an electrical stop motioncircuit forming no part of the present invention. The second side of therelay circuit is grounded in the machine, as indicated at 2|, to whichthe bus bar I! is also grounded.

In operation, the tension of the yarn a: as it is running longitudinallythrough and in contact with the base of the V-shaped trough I0, pressesthe body 2 toward the foot 6, flexing the elements 2 and 3 at thefillets 4 and 5; and the frictional drag of the yarn in the groove [0rocks the detector l in the direction of travel of the yarn, flexing itat the fillet 5. thereby holding the neck 4 out of contact with the edgeI! of the leg I8 of the bus bar I4. thereby forming a c rcuit openiriggap G between the detector I and the bus bar I Should the thread or yarna break or become excessively slack, the detector I will assume theposition shown in broken lines in Fig. 2, with the neck or filletportion 4 of the detector I making contact with the edge ll of the busbar I4, thereby closing the detector circuit and causing the relay 2D tofunction and effect stoppin of the machine in which the yarn a: isoperating.

In instances where a plurality of detectors I are employed and cast ineach of the blocks 1, the groups of detectors I, I may be punched, out,

or otherwise formed from a single strip of metal,

foot 6b may be corrugated, as shown at 26 in Fig. l

5, to receive the points 8, 8 prior to casting of the block. if desired.

I claim:

1. A slack and breakage detector for an axially running normallytensioned rectil near yarn, comprising an inherently resilient unitaryelement including a foot a leg and a body portion successivelyinterconnected and relatively angularly arranged in a common planecoincident with said yarn, guide means at opposite sides respectively ofsaid body portion to insure positioning and re tention of said yarnthereon, means for rigidly supporting said foot i predetermined relationto said yarn to effect flexing of said element to and retention of saidelement in an inactive position in said plane by said yarn when runningnormally therein, and means intersecting said plane for engagement withsa d element under reactive inherent reverse flexing thereof whenreleased-by slack or breakage developing in said yarn, whereby therunning of said yarn will be discontinued.

2. A slack and breakage detector for an axially running normallytensioned rectilinear yarn,

ment including a foot a' leg and a body portion successivelyinterconnected and relatively angularly arranged in a common planecoincident with said yarn, said body portion being groovedlongitudinally in said plane to receive said yarn, means for rigidlysupporting said foot in predetermined relation to said yarn to eflectflexing of said element to and retention or said element in an inactiveposition in said plane by said yarn when running normally therein, andmeans intersecting said plane for engagement with said element underreactive inherent reverse flexing thereof when released by slack orbreakage'developing in said yarn, whereby the running of said yarn willbe discontinued.

3. A slack and breakage detector for an axially running normallytensioned rectilinear yarn, comprising an inherently resilient unitaryelement including a foot a leg and a body portion successivelyinterconnected and relatively angularly arranged in a common planecoincident with said yarn, said body portion being groovedlongitudinally in said plane to receive said yarn, guide means atopposite sides respectively of said body portion to insure positioningof said yarn in the longitudinal groove of said body portion, means forrigidly supporting said foot in predetermined relation to said yarn toeffect flexing of said element to and retention of said element in aninactive position in said plane by said yarn when running normallytherein, and means intersecting said plane for engagement with saidelement under reaction inherent reverse flexing thereof when released byslack or breakage developing in said yarn, whereby the running of saidyarn will be discontinued.

4. A slack and breakage detector for an axially running normallytensioned rectilinear yarn, comprising an inherently resilient unitaryelement including a foot a leg and a body portion successivelyinterconnected and relatively angularly arranged in a common planecoincident with said yarn, said body portion being longitudinally curvedand grooved in said plane to receive and retain said yarn therein, meansfor rigidly supporting said foot in predetermined relation to said yarnto efiect flexing of said element to and retention of said element in aninactive position in said plane by said yarn when running normallytherein, and means intersecting said plane for engagement with saidelement under reactive inherent reverse flexing thereof when released byslack or breakage developing in said yarn, whereby the running of saidyarn will be discontinued;

5. An inherently resilient yarn contacting element comprising alongitudinally arcuate body portion, of substantially V-shaped incross-section adapted to receive and guide a strand of yarn, a legportion connected at one of its ends to one end of said body portion anddisposed at an acute angle to said body portion in a common planetherewith, and a foot portion connected to the opposite end of said legportion for mounting said element to afiord flexing of said body and legportions relative to eachother and with respect to said foot portion. jp

6. An inherently resilient yarn contacting element comprising alongitudinally arcuate body portion grooved substantially throughout itslength to receive'and prevent lateral shifting of a strand of yarnrelative thereto, a leg portion connected at one of. its ends to one endof said body portion and disposed at an acute angle to said said legportion for mounting said element to aflord flexing of said body and legportions relative to each other and with respect to said foot portion.

7. An inherently resilient yarn contacting elementcomprising alongitudinally arcuate body portion of V-shaped cross section, a legportion of rectangular cross section connected at one of corrugated andoffset between said leg portions for the purpose described.

11. A slack and breakage detector for an axially running normallytensioned rectilinear yarn, comprising an inherently resilient unitaryelement including a foot, a leg and a body portion successivelyinterconnected with said body portion being grooved longitudinally toreceive said its ends-to one of said body portion and disposed portionof substantially V-shape in cross-sec-' tion adapted to receive andguide a strand of yarn, a leg portion connected at one of its ends toone end of said body portion and disposed at an acute angle to said bodyportion in a common plane therewith, and a foot portion connected to theopposite end of said leg portion and disposed at an obtuse angle withrespect thereto and disposed within said common plane for mounting saidelement to afiord flexing of said body and leg portions relative to eachother and with respect to said foot portion, a

9. An inherently resilient yarn contactin element comprising alongitudinally arcuate body portion of substantially V-shape incross-section adapted to receive and guide a strand of yarn, a legportion connected at one of itsv ends to one end of said body portionand disposed at an acute angle to said body portion in a common planetherewith, a short radius fillet portion of rectangular cross sectionintermediate said body and leg portions and connected at its oppositeends respectively thereto, and a foot portion connected to the oppositeend of saidleg portion for mounting said element to afiord flexing ofsaid body and leg portions-relative to each other and with respect tosaid foot portion.

10. A structure, comprising a plurality of yarn contacting elementsarranged in laterally spaced relation and each including alongitudinally arcuate body portion, a leg portion connectedjat-one ofits ends to one end of said body portion, and a common foot portionconnected to the opposite end of each of said leg portions of saidplurality of said elements, said common foot portion being yarn, meansfor rigidly supporting said foot in predetermined relation to said yarnto efiect flexing of said element to and retention of said element in aninactive position by said yarn when running therein, and meansengageable by said element under reactive inherent reverse flexingthereof when released by slack or breakage developing in said yarn,whereby the running of said yarn will be discontinued.

12. A slack and breakage detector for an axially running normallytensioned rectilinear yarn, comprising an inherently resilient unitaryelement including a foot, a leg and a body portion successivelyinterconnected and relatively angularly arranged -with said body portionbeing grooved longitudinally to receive said yarn, guide means atopposite sides respectively of said body portion to insure positioningof said yarn in the longitudinal groove of said body portion, means forrigidly supporting said foot in predetermined relation to said yarn toeffect flexing of said element to and retention of said element in aninactive position by said yarn when running therein, and meanspositioned for engagement by said element under reactive inherentreverse flexing thereof when released by slack or breakage de-' velopingin said yarn, whereby the running of said yarn will be discontinued.

, JULIA KYNER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

